// For flags

CVE-2021-34520

Microsoft SharePoint Server Remote Code Execution Vulnerability

Severity Score

8.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Microsoft SharePoint Server Remote Code Execution Vulnerability

Una vulnerabilidad de Ejecución de Código Remota de Microsoft SharePoint Server. Este ID de CVE es diferente de CVE-2021-34467, CVE-2021-34468

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Microsoft SharePoint. Authentication is required to exploit this vulnerability.
The specific flaw exists within the Microsoft.SharePoint.WorkflowActions.SetVariableActivity class. A crafted SetVariableActivity element can result in instantiation of an arbitrary .NET type. An attacker can leverage this vulnerability to execute code in the context of the web service account.

*Credits: Anonymous
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
Partial
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-06-09 CVE Reserved
  • 2021-07-14 CVE Published
  • 2024-08-04 CVE Updated
  • 2024-11-16 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-502: Deserialization of Untrusted Data
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Microsoft
Search vendor "Microsoft"
 Sharepoint Foundation
Search vendor "Microsoft" for product "Sharepoint Foundation"
 2013
Search vendor "Microsoft" for product "Sharepoint Foundation" and version "2013"
sp1
Affected
Microsoft
Search vendor "Microsoft"
 Sharepoint Server
Search vendor "Microsoft" for product "Sharepoint Server"
 2016
Search vendor "Microsoft" for product "Sharepoint Server" and version "2016"
enterprise
Affected
Microsoft
Search vendor "Microsoft"
 Sharepoint Server
Search vendor "Microsoft" for product "Sharepoint Server"
 2019
Search vendor "Microsoft" for product "Sharepoint Server" and version "2019"
-
Affected